diff --git a/doc/notes b/doc/notes
new file mode 100644
index 0000000..afd4b2e
--- /dev/null
+++ b/doc/notes
@@ -0,0 +1,2 @@
+initrd:
+https://help.ubuntu.com/community/LiveCDCustomization#Removing_the_.28Casper.29_Autologina
diff --git a/src/func/filesystem_extract b/src/func/filesystem_extract
index 2ca5bdb..acc43fb 100755
--- a/src/func/filesystem_extract
+++ b/src/func/filesystem_extract
@@ -2,6 +2,9 @@
 #remaster lib
 [ -d "<LIBDIR>" ] || { echo "LIBDIR not exist"; exit 1; }
 
+#dependency
+source <LIBDIR>/func/filesystem_get_type
+
 #filesystem_extract [filesystem_img_source] [chroot_path]
 function filesystem_extract() {
 	echo "extract filesystem ..."